EP2842364B1 - Method to address infrequent transmission - Google Patents
Method to address infrequent transmission Download PDFInfo
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- EP2842364B1 EP2842364B1 EP12875494.2A EP12875494A EP2842364B1 EP 2842364 B1 EP2842364 B1 EP 2842364B1 EP 12875494 A EP12875494 A EP 12875494A EP 2842364 B1 EP2842364 B1 EP 2842364B1
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- 238000000034 method Methods 0.000 title claims description 44
- 230000005540 biological transmission Effects 0.000 title claims description 38
- 239000003550 marker Substances 0.000 claims description 32
- 230000004044 response Effects 0.000 claims description 10
- 230000008569 process Effects 0.000 claims description 9
- 238000007689 inspection Methods 0.000 claims description 3
- 238000004364 calculation method Methods 0.000 claims description 2
- 238000001514 detection method Methods 0.000 claims 2
- 230000011664 signaling Effects 0.000 description 16
- 238000004891 communication Methods 0.000 description 12
- 230000015654 memory Effects 0.000 description 11
- 238000004590 computer program Methods 0.000 description 8
- 230000006870 function Effects 0.000 description 5
- 230000009849 deactivation Effects 0.000 description 4
- 238000007792 addition Methods 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000004913 activation Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000010295 mobile communication Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W76/00—Connection management
- H04W76/30—Connection release
- H04W76/34—Selective release of ongoing connections
- H04W76/36—Selective release of ongoing connections for reassigning the resources associated with the released connections
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
- H04W28/18—Negotiating wireless communication parameters
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/70—Services for machine-to-machine communication [M2M] or machine type communication [MTC]
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W76/00—Connection management
- H04W76/30—Connection release
- H04W76/32—Release of transport tunnels
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W76/00—Connection management
- H04W76/30—Connection release
- H04W76/38—Connection release triggered by timers
Definitions
- Communication systems such as an evolved packet system, may benefit from methods for addressing infrequent transmissions.
- certain communication systems in which machine type communication devices are deployed may benefit from a machine type communication feature for infrequent transmission.
- the evolved packet system provides radio interfaces and packet core network functions for broadband wireless data access.
- EPS core network functions include the mobility management entity (MME), the packet data network gateway (PDN-GW) and the Serving Gateway (S-GW).
- MME mobility management entity
- PDN-GW packet data network gateway
- S-GW Serving Gateway
- An example of an evolved packet core architecture is illustrated in Figure 1 and is described by third generation partnership project (3GPP) technical specification (TS) 23.401.
- 3GPP third generation partnership project
- a common packet domain core network can be used for both radio access networks (RANs), the global system for mobile communication (GSM) enhanced data rates for GSM evolution (EDGE) radio access network (GERAN) and the universal terrestrial radio access network (UTRAN).
- GSM global system for mobile communication
- EDGE enhanced data rates for GSM evolution
- GERAN global system for mobile communication
- UTRAN universal terrestrial radio access network
- MTC-IWF MTC interworking function
- S6m machine-type-communication
- Tsp mobile subscriber integrated services digital network number
- Tsms packet data protocol
- T5a/b/c packet data protocol
- T4 machine-type-communication
- FIG 2 illustrates machine-type-communication additions to the 3GPP architecture, as well as the various interfaces identified.
- the MTC-IWF and the new interfaces in 3GPP Release 11 (Rel 11) can, for example, enable triggering of devices with or without a mobile subscriber integrated services digital network number (MSISDN) from an internal or external MTC server.
- MSISDN mobile subscriber integrated services digital network number
- the triggering of the devices may be, for example, in order to establish a packet data network (PDN) connection and/or packet data protocol (PDP) context.
- PDN packet data network
- PDP packet data protocol
- Certain MTC devices such as smart meters, may send and/or receive infrequently compared to devices such as mobile phones.
- transmission of data in such systems is performed using an established bearer.
- the bearer remains active until the user equipment or network explicitly initiates deactivation of the established bearer.
- US 2009/0225705 A1 discloses a gateway and a terminal negotiating a QoS in a network interworking system.
- the terminal negotiates a QoS with a WLAN access point and establishes a WLAN access bearer.
- the terminal negotiates a QoS with the gateway for packet exchange through the WLAN access bearer.
- a method includes negotiating at least one characteristic of a bearer. The method also includes deactivating the bearer based on the at least one characteristic.
- an apparatus includes at least one processor and at least one memory including computer program instructions.
- the at least one memory and the computer program instructions are configured to, with the at least one processor, cause the apparatus at least to negotiate at least one characteristic of a bearer.
- the at least one memory and the computer program instructions are also configured to, with the at least one processor, cause the apparatus at least to deactivate the bearer based on the at least one characteristic.
- An apparatus includes negotiating means for negotiating at least one characteristic of a bearer.
- the apparatus also includes deactivating means for deactivating the bearer based on the at least one characteristic.
- a non-transitory computer readable medium in certain embodiments, is encoded with instructions that, when executed in hardware, perform a process.
- the process includes negotiating at least one characteristic of a bearer.
- the process also includes deactivating the bearer based on the at least one characteristic.
- a machine type communication (MTC) feature for infrequent transmission can be used, for example, with MTC devices that are expected to send or receive data infrequently, with a long period between consecutive data transmissions.
- MTC machine type communication
- the network can reserve resources only when transmission occurs. Moreover, when there is data to transmit and/or receive, the MTC device can connect to the network, transmit and/or receive the data, then, following successful transmission/reception, return to a state in which the MTC device is not attached to the network.
- This feature can be used in various ways. For example, this feature can be used by a device that needs to transmit a file infrequently.
- the file may be a large file, such as a log file.
- a user may need access to a network only for a defined period, such as when prepaid access is obtained for a specified duration.
- At least one characteristic of the bearer can be negotiated. For example, as shown in Figure 3 , a validity time or duration can be negotiated. Alternatively, as shown in Figure 4 , an end-marker for the bearer can be negotiated. This negotiation can take place when the bearer is being established. The negotiated characteristic can serve to provide an indication to deactivate the bearers with or without an explicit signaling procedure on the control plane. The duration for the bearer can also be limited by a subscription for the device.
- the network and the UE can locally deactivate the bearers without an explicit signaling procedure.
- the network may also initiate explicit signaling procedure to deactivate the bearer and/or detach the UE.
- the UE and network negotiated an end-marker for the bearer, then in certain embodiments the UE or network, if known by the network, can indicate this "end marker" to the network.
- the end marker can be detected by a deep packet inspection (DPI) function within the P-GW/GGSN or can be an explicit part of the user plane packets, such as a particular GTP-U header. This indication could be sent from UE to network in an acknowledgement to the last received or sent application packet.
- DPI deep packet inspection
- the network can also mark the last packet sent to the UE. Once the network receives this "end marker" indication or detects end of transmission itself, then it can initiate deactivation of established bearer with or without explicit signaling procedure. Similarly, the UE can initiate deactivation of established bearer with or without explicit signaling procedure.
- LTE long term evolution
- PDN packet data network
- the above principles can be applied in general packet radio service (GPRS), universal mobile telecommunications system (UMTS) with respect to a packet data protocol (PDP) context activation procedure, and LTE with respect to a PDN connection establishment procedure.
- GPRS general packet radio service
- UMTS universal mobile telecommunications system
- PDP packet data protocol
- LTE packet data protocol
- the above principles can also be applied to negotiating the duration for a UE being attached to a network.
- Figures 3 and 4 describe two alternatives. According to the alternative illustrated in Figure 3 , there can be negotiation of duration, or validity time for the bearer, when the bearer is being established. Alternatively, as described in Figure 4 , there can be negotiation of the end-marker to indicate an end of transmission when the bearer is being established. In this alternative, the UE can either inform the network about the size of the transmission needed or the duration for the transmission using the bearer to be established.
- the P-GW/GGSN can compute the expected duration based on the bandwidth to be allocated for the bearer. For instance, in EPC, P-GW can take APN-AMBR for a non-guaranteed bit rate (non-GBR) bearer, MBR for guaranteed bit rate (GBR) bearer, packet delay budget, GBR vs non-GBR bearer into account when computing the expected duration for the bearer. Some safety duration can then be added to the estimated duration time, at least for non-GBR bearers, to avoid a situation in which the bearer is terminated before the transmission ends. This estimated duration can be provided to the UE as a negotiated duration for the bearer.
- non-GBR non-guaranteed bit rate
- GBR guaranteed bit rate
- the P-GW/GGSN can acknowledge this as a negotiated duration to the UE. This negotiated duration could be limited by subscription for the device.
- FIG. 3 illustrates a signal flow according to certain embodiments.
- a UE can initiate a PDN connectivity request and/or activate a PDP context request and provides the size of the content or the duration of transmission for the bearer.
- the MME and/or serving general packet radio service (GPRS) support node (SGSN) can include the requested size of the content and/or duration of transmission for the bearer in the create session request message to the P-GW and/or gateway GPRS support node (GGSN).
- GPRS general packet radio service
- the P-GW/GGSN can estimate the expected duration of the bearer and can provide that as the negotiated duration in a create session response message, at 303, to the MME/SGSN. Otherwise, if the requested duration was provided, then the P-GW/GGSN can acknowledge the expected duration of the bearer and, at 303, provide that as the negotiated duration in the create session response message to the MME/SGSN.
- the MME/SGSN can provide the negotiated duration in an activate default EPS bearer context request or an activate PDP context response message to the UE.
- the network and the UE can start running a timer, with a value corresponding to the negotiated duration, after the transmission of first uplink packet. Upon expiry of this timer, the UE and the network can locally deactivate the established bearer without any explicit signaling procedure. In LTE, if this is the only bearer that was established, then the UE and network can also perform local detach. The network can mark the UE context to be detached and the UE can move to an EMM-DEREGISTERED state. Alternatively, upon expiry of this timer, the P-GW/GGSN can initiate an explicit signaling procedure to deactivate the bearer.
- the MME can initiate an explicit signaling procedure to detach the UE. This can cause the network to mark the UE context to be detached and the UE can move to an EMM-DEREGISTERED state.
- Figure 4 illustrates another signal flow according to certain embodiments.
- the UE can negotiate the end of transmission with the network when the bearer is being established. This can involve negotiating an end marker that the UE can transmit, for example when it completes the transmission, and the P-GW/GGSN can recognize, such as with the help of a deep packet inspection (DPI) function. For instance, if file transfer protocol (ftp) is being used by the application running in the device, end marker could be "EFID" to indicate the end of file.
- DPI deep packet inspection
- the user equipment can initiate a PDN connectivity request or an activate PDP context request and can provide an end marker for the bearer.
- the MME/SGSN can include the requested end marker for the bearer in the create session request message to the P-GW/GGSN.
- the P-GW/GGSN can acknowledge the end marker for the bearer and can, at 403, provide that end marker as a negotiated end marker in the create session response message to the MME/SGSN.
- the MME/SGSN can provide the negotiated end marker in an activate default EPS bearer context request or activate PDP context response message to the UE.
- the UE can transmit the end marker in the last exchanged user plane packet.
- UE and network will then locally deactivate the established bearer without an explicit signaling procedure.
- the UE and network can also perform local detach.
- the network can mark the UE context to be detached and the UE can move to an EMM-DEREGISTERED state.
- the P-GW/GGSN can initiate an explicit signaling procedure to deactivate the bearer.
- the MME can initiate an explicit signaling procedure to detach the UE. This can cause the network to mark the UE context to be detached and the UE can move to an EMM-DEREGISTERED state.
- Certain examples can provide functionality for MTC devices that transmit data infrequently as well as for normal data users who need data connection only for a defined duration, such as users who operate similar to signing up for 30 minutes of WiFi connection. Moreover, certain embodiments can minimize necessary signaling by avoiding a need for explicit signaling to provide deactivation. Moreover, certain embodiments minimize the network context for devices that may have long periods between activity, which may include durations of minutes, hours, weeks, months, or years.
- a device can be moved to a detached state after transmission is complete, for example in LTE, if it is the last bearer, the UE and the network can locally detach. This can also enhance a user's location privacy.
- Figure 5 illustrates a method according to certain embodiments. As shown in Figure 5 , a method can include, at 510, negotiating at least one characteristic of a bearer. The method of Figure 5 can be performed by the devices illustrated and described in Figure 6 below.
- the negotiating can include negotiating between the user equipment and the network. Moreover, the negotiating can be performed when establishing the bearer.
- the at least one characteristic can include at least one of a validity time of the bearer or an end-marker of the bearer.
- the negotiating can include, at 511, informing the network regarding at least one of a size of a transmission needed or a duration for the transmission.
- the negotiating can also include, at 512, computing, by the network, an expected duration based on a bandwidth to be allocated to the bearer.
- the negotiating can further include, at 513, adding a safety duration to a calculation based on bit rate to determine the expected duration.
- the negotiating can include, at 514, providing the expected duration to a user equipment (UE) as the negotiated duration.
- the negotiating can include, at 515, acknowledging a duration for transmission provided from a user equipment as a negotiated duration.
- the negotiating can more particularly include sending, in a request, at least one of a size of content, a duration of a transmission, or an end marker, wherein the request comprises at least of a packet data network connectivity request, an activate packet data protocol context request, or a create session request. Also, the negotiating can include sending a message to a user equipment, wherein the message includes at least one of a negotiated end marker or a negotiated duration, wherein the message includes at least one of an activate default evolved packet system bearer context request or an activate packet data protocol context response, as respectively illustrated in Figures 3 and 4 above.
- the method can further include, at 520, deactivating the bearer based on the at least one characteristic.
- the deactivating can be performed either with or without an explicit signaling procedure on a control plane.
- the deactivating the bearer can include at least one of deactivating the bearer upon sending the end marker, receiving the end marker, or confirming receipt of the end marker.
- the deactivating can be performed responsive to an end marker exchanged in a user plane packet.
- the method can also include, at 530, determining whether the bearer is a last packet data network connection and, at 535, performing a local detach when the bearer is the last packet data network connection.
- a system may include two devices, such as, for example, UE 610, MME/SGSN 620, and P-GW/GGSN 630. Each of these devices may include at least one processor, respectively indicated as 614, 624, and 634. At least one memory is provided in each device, and indicated as 615, 625, and 635, respectively. The memory may include computer program instructions or computer code contained therein. Transceivers 616, 626, and 636 are provided, and each device may also include an antenna, respectively illustrated as 617, 627, and 637. Other configurations of these devices, for example, may be provided.
- UE 610, MME/SGSN 620, and P-GW/GGSN 630 may be configured for wired communication, rather than wireless communication, and in such a case antennas 617, 627, and 637 would illustrate any form of communication hardware, without requiring a conventional antenna.
- Transceivers 616, 626, and 636 can each, independently, be a transmitter, a receiver, or both a transmitter and a receiver, or a unit or device that is configured both for transmission and reception.
- Processors 614, 624, and 634 can be embodied by any computational or data processing device, such as a central processing unit (CPU), application specific integrated circuit (ASIC), or comparable device.
- the processors can be implemented as a single controller, or a plurality of controllers or processors.
- Memories 615, 625, and 635 can independently be any suitable storage device, such as a non-transitory computer-readable medium.
- a hard disk drive (HDD), random access memory (RAM), flash memory, or other suitable memory can be used.
- the memories can be combined on a single integrated circuit as the processor, or may be separate therefrom.
- the computer program instructions stored in the memory and which may be processed by the processors can be any suitable form of computer program code, for example, a compiled or interpreted computer program written in any suitable programming language.
- the memory and the computer program instructions can be configured, with the processor for the particular device, to cause a hardware apparatus such as UE 610, MME/SGSN 620, and P-GW/GGSN 630, to perform any of the processes described above (see, for example, Figures 3-5 ). Therefore, in certain embodiments, a non-transitory computer-readable medium can be encoded with computer instructions that, when executed in hardware, perform a process such as one of the processes described herein. Alternatively, certain embodiments of the invention can be performed entirely in hardware.
- Figure 6 illustrates a system including a UE, MME/SGSN, and P-GW/GGSN, embodiments of the invention may be applicable to other configurations, and configurations involving additional elements, as illustrated herein.
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Description
- Communication systems, such as an evolved packet system, may benefit from methods for addressing infrequent transmissions. In particular, certain communication systems in which machine type communication devices are deployed may benefit from a machine type communication feature for infrequent transmission.
- The evolved packet system (EPS), the successor of general packet radio system (GPRS), provides radio interfaces and packet core network functions for broadband wireless data access. EPS core network functions include the mobility management entity (MME), the packet data network gateway (PDN-GW) and the Serving Gateway (S-GW). An example of an evolved packet core architecture is illustrated in
Figure 1 and is described by third generation partnership project (3GPP) technical specification (TS) 23.401. A common packet domain core network can be used for both radio access networks (RANs), the global system for mobile communication (GSM) enhanced data rates for GSM evolution (EDGE) radio access network (GERAN) and the universal terrestrial radio access network (UTRAN). - For machine-type-communication (MTC) a functional entity called MTC interworking function (MTC-IWF) and several new interfaces, including S6m, Tsp, Tsms, T5a/b/c and T4, have been introduced to the 3GPP architecture.
Figure 2 illustrates machine-type-communication additions to the 3GPP architecture, as well as the various interfaces identified. The MTC-IWF and the new interfaces in 3GPP Release 11 (Rel 11) can, for example, enable triggering of devices with or without a mobile subscriber integrated services digital network number (MSISDN) from an internal or external MTC server. The triggering of the devices may be, for example, in order to establish a packet data network (PDN) connection and/or packet data protocol (PDP) context. A 3GPP architecture for machine-type communication is discussed in 3GPP TS 23.682. - Certain MTC devices, such as smart meters, may send and/or receive infrequently compared to devices such as mobile phones. Conventionally, transmission of data in such systems is performed using an established bearer. Thus, the bearer remains active until the user equipment or network explicitly initiates deactivation of the established bearer.
US 2009/0225705 A1 discloses a gateway and a terminal negotiating a QoS in a network interworking system. The terminal negotiates a QoS with a WLAN access point and establishes a WLAN access bearer. In addition, the terminal negotiates a QoS with the gateway for packet exchange through the WLAN access bearer. - According to certain embodiments, a method includes negotiating at least one characteristic of a bearer. The method also includes deactivating the bearer based on the at least one characteristic.
- In certain embodiments, an apparatus includes at least one processor and at least one memory including computer program instructions. The at least one memory and the computer program instructions are configured to, with the at least one processor, cause the apparatus at least to negotiate at least one characteristic of a bearer. The at least one memory and the computer program instructions are also configured to, with the at least one processor, cause the apparatus at least to deactivate the bearer based on the at least one characteristic.
- An apparatus, according to certain embodiments, includes negotiating means for negotiating at least one characteristic of a bearer. The apparatus also includes deactivating means for deactivating the bearer based on the at least one characteristic.
- A non-transitory computer readable medium, in certain embodiments, is encoded with instructions that, when executed in hardware, perform a process. The process includes negotiating at least one characteristic of a bearer. The process also includes deactivating the bearer based on the at least one characteristic.
- For proper understanding of the invention, reference should be made to the accompanying drawings, wherein:
-
Figure 1 illustrates an evolved packet core architecture. -
Figure 2 illustrates machine-type-communication additions to a third generation partnership project architecture. -
Figure 3 illustrates a signal flow according to certain embodiments. -
Figure 4 illustrates another signal flow according to certain embodiments. -
Figure 5 illustrates a method according to certain embodiments. -
Figure 6 illustrates a system according to certain embodiments. - A machine type communication (MTC) feature for infrequent transmission can be used, for example, with MTC devices that are expected to send or receive data infrequently, with a long period between consecutive data transmissions.
- For an infrequent transmission MTC feature, the network can reserve resources only when transmission occurs. Moreover, when there is data to transmit and/or receive, the MTC device can connect to the network, transmit and/or receive the data, then, following successful transmission/reception, return to a state in which the MTC device is not attached to the network.
- This feature can be used in various ways. For example, this feature can be used by a device that needs to transmit a file infrequently. The file may be a large file, such as a log file. In another example, a user may need access to a network only for a defined period, such as when prepaid access is obtained for a specified duration.
- Certain embodiments, therefore, provide for an infrequent transmission feature. At least one characteristic of the bearer can be negotiated. For example, as shown in
Figure 3 , a validity time or duration can be negotiated. Alternatively, as shown inFigure 4 , an end-marker for the bearer can be negotiated. This negotiation can take place when the bearer is being established. The negotiated characteristic can serve to provide an indication to deactivate the bearers with or without an explicit signaling procedure on the control plane. The duration for the bearer can also be limited by a subscription for the device. - If the user equipment (UE) and the network negotiate validity time for the bearer, then in certain embodiments the network and the UE can locally deactivate the bearers without an explicit signaling procedure. Alternatively, if signaling traffic is not a concern, the network may also initiate explicit signaling procedure to deactivate the bearer and/or detach the UE. If the UE and network negotiated an end-marker for the bearer, then in certain embodiments the UE or network, if known by the network, can indicate this "end marker" to the network. The end marker can be detected by a deep packet inspection (DPI) function within the P-GW/GGSN or can be an explicit part of the user plane packets, such as a particular GTP-U header. This indication could be sent from UE to network in an acknowledgement to the last received or sent application packet.
- Alternatively the network, if possible, can also mark the last packet sent to the UE. Once the network receives this "end marker" indication or detects end of transmission itself, then it can initiate deactivation of established bearer with or without explicit signaling procedure. Similarly, the UE can initiate deactivation of established bearer with or without explicit signaling procedure.
- Furthermore, in long term evolution (LTE), when the UE and network deactivate the packet data network (PDN) connection, if it is the last PDN connection, the network and UE can perform local detach or it can perform detach using explicit signaling procedure. This may allow the UE to return to a state in which the device is not attached to the network upon completion of transmission at the same time retaining the "always on" feature associated with LTE.
- The above principles can be applied in general packet radio service (GPRS), universal mobile telecommunications system (UMTS) with respect to a packet data protocol (PDP) context activation procedure, and LTE with respect to a PDN connection establishment procedure. The above principles can also be applied to negotiating the duration for a UE being attached to a network.
- As mentioned above,
Figures 3 and4 describe two alternatives. According to the alternative illustrated inFigure 3 , there can be negotiation of duration, or validity time for the bearer, when the bearer is being established. Alternatively, as described inFigure 4 , there can be negotiation of the end-marker to indicate an end of transmission when the bearer is being established. In this alternative, the UE can either inform the network about the size of the transmission needed or the duration for the transmission using the bearer to be established. - If the UE provides the size of the content to be transmitted, then the P-GW/GGSN can compute the expected duration based on the bandwidth to be allocated for the bearer. For instance, in EPC, P-GW can take APN-AMBR for a non-guaranteed bit rate (non-GBR) bearer, MBR for guaranteed bit rate (GBR) bearer, packet delay budget, GBR vs non-GBR bearer into account when computing the expected duration for the bearer. Some safety duration can then be added to the estimated duration time, at least for non-GBR bearers, to avoid a situation in which the bearer is terminated before the transmission ends. This estimated duration can be provided to the UE as a negotiated duration for the bearer.
- Alternatively, if the UE provides the duration for the transmission, then the P-GW/GGSN can acknowledge this as a negotiated duration to the UE. This negotiated duration could be limited by subscription for the device.
-
Figure 3 illustrates a signal flow according to certain embodiments. As shown inFigure 3 , at 301, a UE can initiate a PDN connectivity request and/or activate a PDP context request and provides the size of the content or the duration of transmission for the bearer. Then, at 302, the MME and/or serving general packet radio service (GPRS) support node (SGSN) can include the requested size of the content and/or duration of transmission for the bearer in the create session request message to the P-GW and/or gateway GPRS support node (GGSN). - If the size of the content was provided, then the P-GW/GGSN can estimate the expected duration of the bearer and can provide that as the negotiated duration in a create session response message, at 303, to the MME/SGSN. Otherwise, if the requested duration was provided, then the P-GW/GGSN can acknowledge the expected duration of the bearer and, at 303, provide that as the negotiated duration in the create session response message to the MME/SGSN. At 304, the MME/SGSN can provide the negotiated duration in an activate default EPS bearer context request or an activate PDP context response message to the UE.
- The network and the UE can start running a timer, with a value corresponding to the negotiated duration, after the transmission of first uplink packet. Upon expiry of this timer, the UE and the network can locally deactivate the established bearer without any explicit signaling procedure. In LTE, if this is the only bearer that was established, then the UE and network can also perform local detach. The network can mark the UE context to be detached and the UE can move to an EMM-DEREGISTERED state. Alternatively, upon expiry of this timer, the P-GW/GGSN can initiate an explicit signaling procedure to deactivate the bearer. In LTE, if this is the only bearer that was established, then the MME can initiate an explicit signaling procedure to detach the UE. This can cause the network to mark the UE context to be detached and the UE can move to an EMM-DEREGISTERED state.
-
Figure 4 illustrates another signal flow according to certain embodiments. In this alternative, the UE can negotiate the end of transmission with the network when the bearer is being established. This can involve negotiating an end marker that the UE can transmit, for example when it completes the transmission, and the P-GW/GGSN can recognize, such as with the help of a deep packet inspection (DPI) function. For instance, if file transfer protocol (ftp) is being used by the application running in the device, end marker could be "EFID" to indicate the end of file. - As shown in
Figure 4 , at 401, the user equipment can initiate a PDN connectivity request or an activate PDP context request and can provide an end marker for the bearer. Then, at 402, the MME/SGSN can include the requested end marker for the bearer in the create session request message to the P-GW/GGSN. The P-GW/GGSN can acknowledge the end marker for the bearer and can, at 403, provide that end marker as a negotiated end marker in the create session response message to the MME/SGSN. After that, at 404, the MME/SGSN can provide the negotiated end marker in an activate default EPS bearer context request or activate PDP context response message to the UE. - Upon completion of transmission, the UE can transmit the end marker in the last exchanged user plane packet. UE and network will then locally deactivate the established bearer without an explicit signaling procedure. In LTE, if this is the only bearer that was established, then the UE and network can also perform local detach. The network can mark the UE context to be detached and the UE can move to an EMM-DEREGISTERED state. Alternatively, upon receiving the end marker in the last exchanged user plane packet, the P-GW/GGSN can initiate an explicit signaling procedure to deactivate the bearer. In LTE, if this is the only bearer that was established, then the MME can initiate an explicit signaling procedure to detach the UE. This can cause the network to mark the UE context to be detached and the UE can move to an EMM-DEREGISTERED state.
- Certain examples, therefore, can provide functionality for MTC devices that transmit data infrequently as well as for normal data users who need data connection only for a defined duration, such as users who operate similar to signing up for 30 minutes of WiFi connection. Moreover, certain embodiments can minimize necessary signaling by avoiding a need for explicit signaling to provide deactivation. Moreover, certain embodiments minimize the network context for devices that may have long periods between activity, which may include durations of minutes, hours, weeks, months, or years.
- In certain embodiments, a device can be moved to a detached state after transmission is complete, for example in LTE, if it is the last bearer, the UE and the network can locally detach. This can also enhance a user's location privacy.
-
Figure 5 illustrates a method according to certain embodiments. As shown inFigure 5 , a method can include, at 510, negotiating at least one characteristic of a bearer. The method ofFigure 5 can be performed by the devices illustrated and described inFigure 6 below. - The negotiating can include negotiating between the user equipment and the network. Moreover, the negotiating can be performed when establishing the bearer. The at least one characteristic can include at least one of a validity time of the bearer or an end-marker of the bearer.
- The negotiating can include, at 511, informing the network regarding at least one of a size of a transmission needed or a duration for the transmission. The negotiating can also include, at 512, computing, by the network, an expected duration based on a bandwidth to be allocated to the bearer. The negotiating can further include, at 513, adding a safety duration to a calculation based on bit rate to determine the expected duration. Furthermore, the negotiating can include, at 514, providing the expected duration to a user equipment (UE) as the negotiated duration. Additionally, the negotiating can include, at 515, acknowledging a duration for transmission provided from a user equipment as a negotiated duration.
- The negotiating can more particularly include sending, in a request, at least one of a size of content, a duration of a transmission, or an end marker, wherein the request comprises at least of a packet data network connectivity request, an activate packet data protocol context request, or a create session request. Also, the negotiating can include sending a message to a user equipment, wherein the message includes at least one of a negotiated end marker or a negotiated duration, wherein the message includes at least one of an activate default evolved packet system bearer context request or an activate packet data protocol context response, as respectively illustrated in
Figures 3 and4 above. - The method can further include, at 520, deactivating the bearer based on the at least one characteristic. The deactivating can be performed either with or without an explicit signaling procedure on a control plane.
- When the at least one characteristic includes an end marker, the deactivating the bearer can include at least one of deactivating the bearer upon sending the end marker, receiving the end marker, or confirming receipt of the end marker. For example, the deactivating can be performed responsive to an end marker exchanged in a user plane packet.
- The method can also include, at 530, determining whether the bearer is a last packet data network connection and, at 535, performing a local detach when the bearer is the last packet data network connection.
-
Figure 6 illustrates a system according to certain embodiments of the invention. In one embodiment, a system may include two devices, such as, for example,UE 610, MME/SGSN 620, and P-GW/GGSN 630. Each of these devices may include at least one processor, respectively indicated as 614, 624, and 634. At least one memory is provided in each device, and indicated as 615, 625, and 635, respectively. The memory may include computer program instructions or computer code contained therein.Transceivers UE 610, MME/SGSN 620, and P-GW/GGSN 630 may be configured for wired communication, rather than wireless communication, and in such acase antennas -
Transceivers -
Processors -
Memories - The memory and the computer program instructions can be configured, with the processor for the particular device, to cause a hardware apparatus such as
UE 610, MME/SGSN 620, and P-GW/GGSN 630, to perform any of the processes described above (see, for example,Figures 3-5 ). Therefore, in certain embodiments, a non-transitory computer-readable medium can be encoded with computer instructions that, when executed in hardware, perform a process such as one of the processes described herein. Alternatively, certain embodiments of the invention can be performed entirely in hardware. - Furthermore, although
Figure 6 illustrates a system including a UE, MME/SGSN, and P-GW/GGSN, embodiments of the invention may be applicable to other configurations, and configurations involving additional elements, as illustrated herein. - One having ordinary skill in the art will readily understand that the invention as discussed above may be practiced with steps in a different order, and/or with hardware elements in configurations which are different than those which are disclosed. Therefore, although the invention has been described based upon these preferred embodiments, it would be apparent to those of skill in the art that certain modifications, variations, and alternative constructions would be apparent subject to the appended claims.
Claims (11)
- A method, comprising:negotiating (510) at least one characteristic of a bearer when the bearer is being established between a user equipment and a core network in which the user equipment sends a message to the core network proposing the characteristic and in response to the message the core network sends an acceptance of the proposal;characterised in that the method comprises:
deactivating (520) the bearer based on the at least one characteristic, the at least one characteristic being at least one of a validity time of the bearer, an end-marker of the bearer, the size of a transmission needed, and a duration for a transmission using the bearer. - The method of claim 1, wherein the deactivating (520) the bearer comprises deactivating the bearer upon at least one of sending the end marker, receiving the end marker, or confirming receipt of the end marker.
- The method of claim 1, wherein the deactivating (520) depends on at least one of detection of the end of transmission by a deep packet inspection function or detection of a predetermined header of a user plane packet.
- The method of claim 1, wherein the negotiating (510) comprises computing, by the network, an expected duration based on a bandwidth to be allocated to the bearer.
- The method of claim 4, further comprising:
adding (513) a safety duration to a calculation based on bit rate to determine the expected duration. - The method of claim 4, further comprising:
providing (514) the expected duration to a user equipment as the negotiated duration. - The method of claim 1, wherein the negotiating (510) comprises acknowledging a duration for transmission provided from a user equipment as a negotiated duration.
- The method of claim 1, wherein the negotiating (510) comprises sending a message to a user equipment, wherein the message includes at least one of a negotiated end marker or a negotiated duration, wherein the message includes at least one of an activate default evolved packet system bearer context request or an activate packet data protocol context response.
- The method of claim 1, wherein the negotiating (510) comprises:
sending, in a request, at least one of a size of content, a duration of a transmission, or an end marker, wherein the request comprises at least of a packet data network connectivity request, an activate packet data protocol context request, or a create session request. - An apparatus (610), comprising:a processor (614) capable of negotiating (510) at least one characteristic of a bearer when the bearer is being established between the apparatus and a core network;a transceiver (616) capable of sending a message to the core network proposing the characteristic and receiving an acceptance of the proposal in response to the message from the core network; andcharacterised in that the characteristic is negotiated to be the basis for deactivating (520) the bearer based on the at least one characteristic, the at least one characteristic being at least one of a validity time of the bearer, an end-marker of the bearer, the size of a transmission needed, and a duration for a transmission using the bearer.
- A non-transitory computer readable medium encoded with instructions that, when executed in hardware, perform a process, the process comprising:negotiating (510) at least one characteristic of a bearer when the bearer is being established between a user equipment and a core network in which the user equipment sends a message to the core network proposing the characteristic and in response to the message the core network sends an acceptance of the proposal;characterised in that the process comprises:
deactivating (520) the bearer based on the at least one characteristic, the at least one characteristic being at least one of a validity time of the bearer, an end-marker of the bearer, the size of a transmission needed, and a duration for a transmission using the bearer.
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US8005087B2 (en) | 2008-09-16 | 2011-08-23 | Alcatel Lucent | Application-level processing for default LTE bearer |
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